2010年10月8日 · GM-70 tubes are cheap compared to the parts required to make them sing. If you do a quick search of the tube section for GM-70 you will come up with a few threads. Check out: Hi-end GM70 amplifier with only 2 stages. GM-70 Build Issues. There was one on transformers but I can not seem to find it.

The main advantages of the GM70 is the higher amplification factor (8 instead of 5). Using the 845 it is necessary use a strong driver stage with a very high voltage amplification, low output impedance and it should be able to supply a high current.

The Destination Audio GM70 Integrated Amplifier sets a new standard in the realm of audio perfection. With its unique bridge rectifier, dual triode, and purpose-wound transformers, this amplifier delivers an unparalleled listening experience that will captivate any audiophile.

2010年3月3日 · With B+ of 1000 to 1100V, the GM70 is relatively easy to drive, even using RC coupling is a possibility. However, you need a lot of voltage swing to drive it to the fullest. This is why many people use a pentode with a high amplification factor.

2018年2月10日 · I designed and built a much simpler GM70 amp that I completed about 7 years ago, class A1 fixed bias with interstage driven by a triode connected D3A, and all solid state supply with SiC rectifiers for the 1kV supply and CLCLC filtering with the chokes in the negative lead to minimize stress on the insulation..

Learn about our GM70 Integrated Amplifier, a masterpiece of craftsmanship delivering exceptional audio performance. Explore its features and specifications.

This amplifier without modifications will allow to use the GM70 and the 813 (FU-13) output tubes. The 813 is a general-purpose transmitting beam power tube with thoriated-tungsten filament with a maximum plate dissipation of 125 watts.